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4a-5(a=2)
We move all terms to the left:
4a-5(a-(2))=0
We multiply parentheses
4a-5a+10=0
We add all the numbers together, and all the variables
-1a+10=0
We move all terms containing a to the left, all other terms to the right
-a=-10
a=-10/-1
a=+10
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